newlib-cygwin/newlib/libc/posix/telldir.c

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#ifndef HAVE_OPENDIR
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)telldir.c 5.9 (Berkeley) 2/23/91";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <dirent.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/lock.h>
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/*
* The option SINGLEUSE may be defined to say that a telldir
* cookie may be used only once before it is freed. This option
* is used to avoid having memory usage grow without bound.
*/
#define SINGLEUSE
/*
* One of these structures is malloced to describe the current directory
* position each time telldir is called. It records the current magic
* cookie returned by getdirentries and the offset within the buffer
* associated with that return value.
*/
struct ddloc {
struct ddloc *loc_next;/* next structure in list */
long loc_index; /* key associated with structure */
long loc_seek; /* magic cookie returned by getdirentries */
long loc_loc; /* offset of entry in buffer */
DIR *loc_dirp; /* DIR pointer */
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};
#define NDIRHASH 32 /* Num of hash lists, must be a power of 2 */
#define LOCHASH(i) ((i)&(NDIRHASH-1))
static long dd_loccnt; /* Index of entry for sequential readdir's */
static struct ddloc *dd_hash[NDIRHASH]; /* Hash list heads for ddlocs */
__LOCK_INIT(static, dd_hash_lock);
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/*
* return a pointer into a directory
*/
2002-08-26 Jeff Johnston <jjohnstn@redhat.com> * Makefile.am(LIBC_OBJECTLISTS): Add STDIO64_OBJECTLIST. * Makefile.in: Regenerated. * acinclude.m4: Add support for --enable-newlib-elix-level option. * aclocal.m4: Regenerated. * configure: Ditto. * configure.host: Add code to define _ELIX_LEVEL if --enable-newlib-elix-level option is used. * configure.in: * libc/aclocal.m4: Regenerated. * libc/configure: Ditto. * libc/argz/Makefile.am: Add EL/IX level checking. * libc/argz/Makefile.in: Regenerated. * libc/argz/dummy.c: New file. * libc/ctype/Makefile.am: Add EL/IX level checking. * libc/ctype/Makefile.in: Regenerated. * libc/locale/Makefile.am: Add EL/IX level checking. * libc/locale/Makefile.in: Regenerated. * libc/posix/Makefile.am: Add EL/IX level checking. * libc/posix/Makefile.in: Regenerated. * libc/posix/telldir.c: Add EL/IX level checking. * libc/reent/Makefile.am: Ditto. * libc/reent/fstat64r.c: Ditto. * libc/reent/lseek64r.c: Ditto. * libc/reent/open64r.c: Ditto. * libc/reent/Makefile.in: Regenerated. * libc/search/Makefile.am: Add EL/IX level checking. * libc/search/Makefile.in: Regenerated. * libc/stdio/Makefile.am: Add EL/IX level checking. * libc/stdio/Makefile.in: Regenerated. * libc/stdio64/Makefile.am: Add EL/IX level checking. * libc/stdio64/Makefile.in: Regenerated. * libc/stdio64/dummy.c: New file. * libc/stdio64/fgetpos64.c: Fix so _LARGEFILE_64 macro is checked after first include. * libc/stdio64/fopen64.c: Ditto. * libc/stdio64/freopen64.c: Ditto. * libc/stdio64/fseeko64.c: Ditto. * libc/stdio64/fsetpos64.c: Ditto. * libc/stdio64/ftello64.c: Ditto. * libc/stdio64/tmpfile64.c: Ditto. * libc/stdlib/Makefile.am: Add EL/IX level checking. * libc/stdlib/Makefile.in: Regenerated. * libc/stdlib/mstats.c: Add EL/IX level checking. * libc/string/Makefile.am: Ditto. * libc/string/Makefile.in: Regenerated. * libc/sys/linux/Makefile.am: Add EL/IX level checking. * libc/sys/linux/Makefile.in: Regenerated. * libc/sys/linux/aclocal.m4: Ditto. * libc/sys/linux/configure: Ditto. * libc/sys/linux/aio.c: Add EL/IX level checking. * libc/sys/linux/ftok.c: Ditto. * libc/sys/linux/getdate.c: Ditto. * libc/sys/linux/ids.c: Ditto. * libc/sys/linux/inode.c: Ditto. * libc/sys/linux/io.c: Ditto. * libc/sys/linux/process.c: Ditto. * libc/sys/linux/resource.c: Ditto. * libc/sys/linux/sched.c: Ditto. * libc/sys/linux/sig.c: Ditto. * libc/sys/linux/termios.c: Ditto. * libc/sys/linux/wait.c: Ditto plus add __waitpid and __libc___waitpid weak aliases. * libc/sys/linux/machine/i386/syscall.h: Add new _base macros that generate the code for a syscall, but do not create a weak alias. * libc/syscalls/Makefile.am: Add EL/IX level checking. * libc/syscalls/Makefile.in: Regenerated. * libc/time/tzset_r.c: Change to replace strdup with equivalent functionality. * libc/unix/Makefile.am: Add EL/IX level checking. * libc/unix/Makefile.in: Regenerated.
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#ifndef _ELIX_LEVEL || _ELIX_LEVEL >= 2
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long
_DEFUN(telldir, (dirp),
DIR *dirp)
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{
register int index;
register struct ddloc *lp;
if ((lp = (struct ddloc *)malloc(sizeof(struct ddloc))) == NULL)
return (-1);
#ifdef HAVE_DD_LOCK
__lock_acquire_recursive(dirp->dd_lock);
__lock_acquire(dd_hash_lock);
#endif
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index = dd_loccnt++;
lp->loc_index = index;
lp->loc_seek = dirp->dd_seek;
lp->loc_loc = dirp->dd_loc;
lp->loc_dirp = dirp;
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lp->loc_next = dd_hash[LOCHASH(index)];
dd_hash[LOCHASH(index)] = lp;
#ifdef HAVE_DD_LOCK
__lock_release(dd_hash_lock);
__lock_release_recursive(dirp->dd_lock);
#endif
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return (index);
}
2002-08-26 Jeff Johnston <jjohnstn@redhat.com> * Makefile.am(LIBC_OBJECTLISTS): Add STDIO64_OBJECTLIST. * Makefile.in: Regenerated. * acinclude.m4: Add support for --enable-newlib-elix-level option. * aclocal.m4: Regenerated. * configure: Ditto. * configure.host: Add code to define _ELIX_LEVEL if --enable-newlib-elix-level option is used. * configure.in: * libc/aclocal.m4: Regenerated. * libc/configure: Ditto. * libc/argz/Makefile.am: Add EL/IX level checking. * libc/argz/Makefile.in: Regenerated. * libc/argz/dummy.c: New file. * libc/ctype/Makefile.am: Add EL/IX level checking. * libc/ctype/Makefile.in: Regenerated. * libc/locale/Makefile.am: Add EL/IX level checking. * libc/locale/Makefile.in: Regenerated. * libc/posix/Makefile.am: Add EL/IX level checking. * libc/posix/Makefile.in: Regenerated. * libc/posix/telldir.c: Add EL/IX level checking. * libc/reent/Makefile.am: Ditto. * libc/reent/fstat64r.c: Ditto. * libc/reent/lseek64r.c: Ditto. * libc/reent/open64r.c: Ditto. * libc/reent/Makefile.in: Regenerated. * libc/search/Makefile.am: Add EL/IX level checking. * libc/search/Makefile.in: Regenerated. * libc/stdio/Makefile.am: Add EL/IX level checking. * libc/stdio/Makefile.in: Regenerated. * libc/stdio64/Makefile.am: Add EL/IX level checking. * libc/stdio64/Makefile.in: Regenerated. * libc/stdio64/dummy.c: New file. * libc/stdio64/fgetpos64.c: Fix so _LARGEFILE_64 macro is checked after first include. * libc/stdio64/fopen64.c: Ditto. * libc/stdio64/freopen64.c: Ditto. * libc/stdio64/fseeko64.c: Ditto. * libc/stdio64/fsetpos64.c: Ditto. * libc/stdio64/ftello64.c: Ditto. * libc/stdio64/tmpfile64.c: Ditto. * libc/stdlib/Makefile.am: Add EL/IX level checking. * libc/stdlib/Makefile.in: Regenerated. * libc/stdlib/mstats.c: Add EL/IX level checking. * libc/string/Makefile.am: Ditto. * libc/string/Makefile.in: Regenerated. * libc/sys/linux/Makefile.am: Add EL/IX level checking. * libc/sys/linux/Makefile.in: Regenerated. * libc/sys/linux/aclocal.m4: Ditto. * libc/sys/linux/configure: Ditto. * libc/sys/linux/aio.c: Add EL/IX level checking. * libc/sys/linux/ftok.c: Ditto. * libc/sys/linux/getdate.c: Ditto. * libc/sys/linux/ids.c: Ditto. * libc/sys/linux/inode.c: Ditto. * libc/sys/linux/io.c: Ditto. * libc/sys/linux/process.c: Ditto. * libc/sys/linux/resource.c: Ditto. * libc/sys/linux/sched.c: Ditto. * libc/sys/linux/sig.c: Ditto. * libc/sys/linux/termios.c: Ditto. * libc/sys/linux/wait.c: Ditto plus add __waitpid and __libc___waitpid weak aliases. * libc/sys/linux/machine/i386/syscall.h: Add new _base macros that generate the code for a syscall, but do not create a weak alias. * libc/syscalls/Makefile.am: Add EL/IX level checking. * libc/syscalls/Makefile.in: Regenerated. * libc/time/tzset_r.c: Change to replace strdup with equivalent functionality. * libc/unix/Makefile.am: Add EL/IX level checking. * libc/unix/Makefile.in: Regenerated.
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#endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 2 */
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/*
* seek to an entry in a directory.
* Only values returned by "telldir" should be passed to seekdir.
*/
void
_DEFUN(_seekdir, (dirp, loc),
register DIR *dirp _AND
long loc)
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{
register struct ddloc *lp;
register struct ddloc **prevlp;
struct dirent *dp;
extern long lseek();
#ifdef HAVE_DD_LOCK
__lock_acquire(dd_hash_lock);
#endif
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prevlp = &dd_hash[LOCHASH(loc)];
lp = *prevlp;
while (lp != NULL) {
if (lp->loc_index == loc)
break;
prevlp = &lp->loc_next;
lp = lp->loc_next;
}
if (lp == NULL) {
#ifdef HAVE_DD_LOCK
__lock_release(dd_hash_lock);
#endif
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return;
}
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if (lp->loc_loc == dirp->dd_loc && lp->loc_seek == dirp->dd_seek)
goto found;
(void) lseek(dirp->dd_fd, lp->loc_seek, 0);
dirp->dd_seek = lp->loc_seek;
dirp->dd_loc = 0;
while (dirp->dd_loc < lp->loc_loc) {
dp = readdir(dirp);
if (dp == NULL)
break;
}
found:
#ifdef SINGLEUSE
*prevlp = lp->loc_next;
free((caddr_t)lp);
#endif
#ifdef HAVE_DD_LOCK
__lock_release(dd_hash_lock);
#endif
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}
/* clean out any hash entries from a closed directory */
void
_DEFUN(_cleanupdir, (dirp),
register DIR *dirp)
{
int i;
#ifdef HAVE_DD_LOCK
__lock_acquire(dd_hash_lock);
#endif
for (i = 0; i < NDIRHASH; ++i) {
register struct ddloc *lp;
register struct ddloc *prevlp;
lp = dd_hash[i];
while (lp != NULL && lp->loc_dirp == dirp) {
dd_hash[i] = lp->loc_next;
prevlp = lp;
free((caddr_t)lp);
lp = prevlp->loc_next;
}
prevlp = lp;
while (lp != NULL) {
lp = lp->loc_next;
if (lp != NULL && lp->loc_dirp == dirp) {
prevlp->loc_next = lp->loc_next;
free((caddr_t)lp);
lp = prevlp;
}
else
prevlp = lp;
}
}
#ifdef HAVE_DD_LOCK
__lock_release(dd_hash_lock);
#endif
}
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#endif /* ! HAVE_OPENDIR */